Which set of three numbers could represent the lengths of the sides of a right triangle?

a.

7, 24, 25

b.

8, 9, 10

c.

9, 11, 14

d.

15, 18, 21

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?